A pressure sensor with overload protection function

Abstract

The present invention relates to the field of pressure sensor protection technology, and discloses a pressure sensor with an overload protection function, comprising a shell, wherein a protection component and a sensitive component are installed inside the shell. The pressure sensor with an overload protection function, through the coordinated use of a reset device and a magnetic device in the protection component, when the pressure value of the pressure sensing block reaches the set value of the regulating element in the control element, the second electromagnet in the limit block is energized first, so that the moving block enters the interior of the fixed block, and then the first electromagnet is energized to generate a magnetic force to move the lifting block downward, thereby driving the sensitive component connected to the lifting block to move downward, protecting the sensitive component, thereby avoiding damage to the sensitive component due to excessive pressure, and when the magnetic device loses power, the elastic force of the first spring and the second spring enables the sensitive component and the limit block to be automatically reset for normal use, thereby achieving the purpose of automatic overload protection.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure sensor protection, and in particular to a pressure sensor with an overload protection function. Background Art

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. A pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools and pipelines.

[0003] Each finished pressure sensor in the prior art has a standard range. During the process of applying a pressure load, if the load exceeds the range of the pressure sensor, it will cause the elastic body inside the pressure sensor to undergo irreversible deformation, causing the test system to malfunction, thereby affecting the operation of the equipment and the accuracy of the test. In addition, in actual use, many operations and force application processes are relatively complicated, and it is impossible to always ensure that the load applied to the pressure sensor changes within the standard range, which can easily lead to damage. Therefore, a pressure sensor with an overload protection function is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a pressure sensor with an overload protection function, which has advantages such as automatic overload protection. It solves the problem that many operations and force application processes of the existing pressure sensors are complicated during actual use, and it is impossible to always ensure that the load applied to the pressure sensor changes within the standard range, which easily leads to damage.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of automatic overload protection, the present invention provides the following technical solution: a pressure sensor with overload protection function, comprising a housing, a protection component and a sensitive component are installed inside the housing, and the sensitive component is electrically connected to the protection component through a wire;

[0008] The protection component includes a lifting device or a pressure relief device, the lifting device or the pressure relief device is electrically connected to a control element for controlling the up and down movement of the sensitive component, and the lifting device includes a reset device and a magnetic device;

[0009] The sensitive component comprises a pressure sensing block and a connecting block, and the pressure sensing block is mounted on the connecting block.

[0010] Preferably, the pressure relief device comprises a pressure relief valve and a hollow tube, and the hollow tube is connected to a pressure rod and an exhaust pipe.

[0011] Preferably, the resetting device comprises a cylinder, a lifting block and a first spring are installed inside the cylinder, the first spring is connected to the outside of the lifting block, and one end of the lifting block is connected to the connecting block.

[0012] Preferably, the lifting block comprises a round rod, one end of the round rod is connected to a round piece, a buffer ring is connected to the round piece, and one end of the round rod away from the round piece is provided with a thread.

[0013] Preferably, the magnetic device comprises a first electromagnet, an electrical connector and a limit block, the electrical connector is electrically connected to the first electromagnet and the limit block via a wire, and the first electromagnet is used to generate a magnetic force to move the sensitive component downward.

[0014] Preferably, the limit block includes a fixed block, the interior of the fixed block is connected to a second electromagnet and a second spring, the fixed block is connected to a moving block via the second spring, and the second electromagnet is used to generate a magnetic force to move the moving block toward the interior of the fixed block.

[0015] Preferably, an adjusting element is further provided inside the control element, and the adjusting element is used to set a rated pressure value. When the pressure of the sensitive component is greater than the rated value, the magnetic device drives the sensitive component to move downward for protection.

[0016] Preferably, the shell includes a base, the base is connected to a cover, the cover is connected to a round tube, a pressure relief channel is provided inside the round tube, and a waterproof breathable membrane is connected inside the pressure relief channel.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a pressure sensor with an overload protection function, which has the following beneficial effects:

[0019] 1. The pressure sensor with overload protection function uses a reset device and a magnetic device in a protection component. When the pressure value of the pressure sensing block reaches the set value of the regulating element in the control element, the second electromagnet in the limit block is energized first, so that the moving block enters the interior of the fixed block, and then the first electromagnet is energized to generate a magnetic force to move the lifting block downward, thereby driving the sensitive component connected to the lifting block to move downward and enter the interior of the round tube to protect the sensitive component, thereby avoiding damage to the sensitive component due to excessive pressure, and through the coordinated use of the first spring and the second spring, when the magnetic device loses power, the elastic force of the first spring and the second spring allows the sensitive component and the limit block to be automatically reset for normal use, thereby achieving the purpose of automatic overload protection.

[0020] 2. The pressure sensor with overload protection function uses a limit block. The moving block in the limit block locks the position of the lifting block during normal use to prevent the pressure on the sensitive component from pressing it down, so that the sensitive component can be stably detected during normal use. The buffer ring has a shock-absorbing function to prevent the first electromagnet from being damaged during the descent of the lifting block, thereby achieving the purpose of stable detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a cross-sectional schematic diagram of a pressure sensor with an overload protection function proposed by the present invention.

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of a pressure sensor with overload protection function proposed by the present invention.

[0023] Figure 3 This is a schematic diagram of a lifting block in a pressure sensor with overload protection function proposed by the present invention.

[0024] Figure 4 This is a schematic diagram of a limit block in a pressure sensor with overload protection function proposed by the present invention.

[0025] Figure 5 Another structure of a protection component in a pressure sensor with overload protection function proposed by the present invention.

[0026] In the figure: 1 base, 2 cover, 3 electrical connector, 4 round tube, 5 pressure sensing block, 6 cylinder, 7 connecting block, 8 lifting block, 801 round rod, 802 disc, 803 buffer ring, 804 thread, 9 first spring, 10 limit block, 1001 fixed block, 1002 second electromagnet, 1003 moving block, 1004 second spring, 11 first electromagnet, 12 control element, 13 pressure relief channel, 14 pressure relief valve, 15 hollow tube, 16 pressure rod, 17 exhaust pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Please refer to 1-4, a pressure sensor with overload protection function, including a shell, the shell includes a base 1, the base 1 is connected to a cover 2, the cover 2 is connected to a round tube 4, the inside of the round tube 4 is provided with a pressure relief channel 13, the inside of the pressure relief channel 13 is connected to a waterproof breathable membrane, a protection component and a sensitive component are installed inside the shell, the sensitive component is connected to the protection component by wires, the sensitive component includes a pressure sensing block 5 and a connecting block 7, and the pressure sensing block 5 is installed on the connecting block 7;

[0029] The protection component includes a reset device, a magnetic device and a control element 12. The control element 12 can be a PLC. The control element 12 and the magnetic device are electrically connected through a wire to control the opening and closing of the magnetic device. An adjusting element is also provided inside the control element 12. The adjusting element can be a single-chip microcomputer. The adjusting element is used to set a rated pressure value. When the pressure of the sensitive component is greater than the rated value, the magnetic device first retracts the limit block 10 and then drives the sensitive component to move downward for protection. The reset device includes a cylinder 6. A lifting block 8 and a first spring 9 are installed inside the cylinder 6. The first spring 9 is connected to the outside of the lifting block 8. One end of the lifting block 8 is connected to the connecting block 7. The lifting block 8 includes a round rod 801. One end of the round rod 801 is connected to a disc 802. A buffer ring 803 is connected to the disc 802. The buffer ring 803 can be made of polystyrene foam plastic. A thread 804 is provided at one end of the round rod 801 away from the disc 802. The magnetic device is used to control the reset device to drive the sensitive component to move up and down.

[0030] The magnetic device includes a first electromagnet 11, an electrical connector 3 and a limit block 10. The limit block 10 includes a fixed block 1001. The fixed block 1001 is a hollow cylinder and is connected to the round tube 4. The interior of the fixed block 1001 is connected with a second electromagnet 1002 and a second spring 1004. The fixed block 1001 is connected with a moving block 1003 through the second spring 1004. The second electromagnet 1002 is used to generate a magnetic force to move the moving block 1003 toward the interior of the fixed block 1001. The electrical connector 3 is electrically connected to the first electromagnet 11 and the limit block 10 through a wire. The first electromagnet 11 is used to generate a magnetic force to move the sensitive component downward.

[0031] Another embodiment of the protection component is also provided, see Figure 5The difference is that a pressure rod 16 is connected to the bottom of the connecting block 7, and the pressure rod 16 is connected to the inside of the hollow tube 15. A pressure relief valve 14 is connected to the outside of the hollow tube 15. The pressure relief valve 14 and the control element 12 are electrically connected. An exhaust pipe 17 is also connected to the pressure relief valve 14. When the pressure exceeds the rated value, the control element 12 controls the pressure relief valve 14 to release the pressure. Under the action of atmospheric pressure, the pressure rod 16 moves downward, driving the sensitive element to retract into the circular tube 4.

[0032] When using:

[0033] (1) The control element 12 and the regulating element inside it monitor the pressure value detected by the sensitive component. When the detected pressure value is greater than the rated value of the regulating element, the control element 12 first energizes the second electromagnet 1002 in the limit block 10 to retract the moving block 1003, and then energizes the first electromagnet 11. The magnetic force generated drives the lifting block 8 to move downward, and then drives the sensitive component connected to the lifting block 8 to move downward into the interior of the circular tube 4 to prevent the sensitive component from being damaged.

[0034] (2) When the sensitive component does not detect a pressure value exceeding the rated value, the first electromagnet 11 loses power first, and the lifting block 8 is reset under the action of the first spring 9. Then the second electromagnet 1002 loses power, and the second spring 1004 resets the moving block 1003, thereby locking the lifting block 8.

[0035] The pressure sensor with overload protection function cooperates with the reset device and the magnetic device in the protection component. When the pressure value of the pressure sensing block 5 reaches the set value of the adjustment element in the control element 12, the second electromagnet 1002 in the limit block 10 is energized first, so that the movable block 1003 enters the interior of the fixed block 1001, and then the first electromagnet 11 is energized to generate magnetic force to move the lifting block 8 downward, thereby driving the sensitive component connected to the lifting block 8 to move downward and enter the interior of the circular tube 4 to protect the sensitive component, thereby avoiding excessive pressure and preventing the sensitive component from being damaged. Moreover, through the cooperation of the first spring 9 and the second spring 1004, when the magnetic device loses power, the elastic force of the first spring 9 and the second spring 1004 allows the sensitive component and the limit block 10 to be automatically reset for normal use, thereby achieving the purpose of automatic overload protection, and solving the problem that many operations and force application processes of the existing pressure sensor are relatively complicated during actual use, and it is impossible to always ensure that the load applied to the pressure sensor changes within the standard range, which is easy to cause damage to the pressure sensor.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure sensor with overload protection function, characterized in that : comprising a housing, a protection component and a sensitive component are installed inside the housing, and the sensitive component is connected to the protection component by telecommunication through a wire; The protection component comprises a lifting device, the lifting device is electrically connected to a control element (12) for controlling the up and down movement of the sensitive component, and the lifting device comprises a reset device and a magnetic device; The sensitive component comprises a pressure sensing block (5) and a connecting block (7), wherein the pressure sensing block (5) is mounted on the connecting block (7); The reset device comprises a cylinder (6), a lifting block (8) and a first spring (9) are installed inside the cylinder (6), the first spring (9) is connected to the outside of the lifting block (8), and one end of the lifting block (8) is connected to the connecting block (7); The magnetic device comprises a first electromagnet (11), an electrical connector (3) and a limit block (10); the electrical connector (3) is electrically connected to the first electromagnet (11) and the limit block (10) via a wire; the first electromagnet (11) is used to generate a magnetic force that causes the sensitive component to move downward.

2. The pressure sensor with overload protection function according to claim 1, characterized in that: The lifting block (8) comprises a round rod (801), one end of the round rod (801) is connected to a round piece (802), a buffer ring (803) is connected to the round piece (802), and a thread (804) is formed at one end of the round rod (801) away from the round piece (802).

3. The pressure sensor with overload protection function according to claim 1, characterized in that: The limit block (10) comprises a fixed block (1001), the interior of the fixed block (1001) is connected to a second electromagnet (1002) and a second spring (1004), the fixed block (1001) is connected to a moving block (1003) via the second spring (1004), and the second electromagnet (1002) is used to generate a magnetic force that causes the moving block (1003) to move toward the interior of the fixed block (1001).

4. The pressure sensor with overload protection function according to claim 1, characterized in that: An adjusting element is also provided inside the control element (12), and the adjusting element is used to set a rated pressure value. When the pressure of the sensitive component is greater than the rated value, the magnetic device drives the sensitive component to move downward for protection.

5. The pressure sensor with overload protection function according to claim 1, characterized in that: The shell comprises a base (1), the base (1) is connected to a cover (2), the cover (2) is connected to a round tube (4), a pressure relief channel (13) is provided inside the round tube (4), and a waterproof breathable membrane is connected inside the pressure relief channel (13).

6. The pressure sensor with overload protection function according to claim 1, characterized in that: The protection component comprises a pressure relief device, which comprises a pressure relief valve (14) and a hollow tube (15), wherein the hollow tube (15) is connected to a pressure rod (16) and an exhaust pipe (17); the bottom of the connecting block (7) is connected to a pressure rod (16), wherein the pressure rod (16) is connected to the inside of the hollow tube (15), and the outside of the hollow tube (15) is connected to a pressure relief valve (14), wherein the pressure relief valve (14) and the control element (12) are connected by telecommunication, and the pressure relief valve (14) is also connected to an exhaust pipe (17).

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